dart-memory

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Original

English

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Chinese

Mobile devices have limited RAM. Efficient memory management is critical to prevent crashes and ensure a smooth user experience.

移动设备的RAM有限。高效的内存管理对于防止崩溃和确保流畅的用户体验至关重要。

Explicit Disposal: Always close

StreamController

Timer

FocusNode

, and

ChangeNotifier

in the

dispose()

method.

Late Initialization: Use
```
late
```
to delay object creation until it's actually needed, reducing initial memory footprint.

显式释放：务必在

dispose()

方法中关闭

StreamController

、

Timer

、

FocusNode

和

ChangeNotifier

。

Generational GC: Dart's GC is optimized for short-lived objects. However, creating thousands of objects in a single frame can still cause jank.
Object Re-use: Avoid creating new objects in
```
build()
```
or high-frequency loops. Reuse data structures where possible.
Large Collections: Clearing a large list (
```
list.clear()
```
) is better than re-assigning it to a new list if the list itself is long-lived.

Isolates: Use
```
Isolate.run()
```
for heavy computations (JSON parsing > 1MB, image processing). This keeps the main thread free and prevents UI freezes.
Image Memory: Use
```
cacheWidth
```
and
```
cacheHeight
```
in
```
Image.network
```
or
```
Image.asset
```
to avoid loading high-resolution images into memory at full size.
Memory Leaks: Use the DevTools Memory View to identify "leaking" objects that stay in the heap after their context (like a screen) is closed.

Isolate：对于繁重计算（解析大于1MB的JSON、图像处理），使用
```
Isolate.run()
```
。这能让主线程保持空闲，避免UI冻结。
图片内存：在
```
Image.network
```
或
```
Image.asset
```
中使用
```
cacheWidth
```
和
```
cacheHeight
```
，避免将高分辨率图片以全尺寸加载到内存中。
内存泄漏：使用DevTools的内存视图来识别在上下文（如某个页面）关闭后仍留在堆中的“泄漏”对象。

Pagination: Never load entire datasets into memory. Use server-side or local database pagination (Isar, SQLite).
Streaming: For large files or real-time data, use
```
Stream
```
to process data in chunks rather than buffering the entire content in memory.